import cv2

filename = "./images/cube.jpg"

img = cv2.imread(filename,0)

sx = cv2.Sobel(img, cv2.CV_64F, 1,0, ksize=3, scale= 1/8)


cv2.imshow("sx", sx)

if cv2.waitKey(0) & 0xff == 27:
    cv2.destroyAllWindows()